CBSE 12 Chemistry Question Paper-2021 Term-1 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Chemistry Question Paper-2021 Term-1
CBSE 12 Chemistry Question Paper-2021 Term-1

CBSE 12 Chemistry Question Paper-2021 Term-1

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2021 Term-1, helping students understand exam trends and practice real paper format

2025-08-12
Pavan Pavan
CBSE Class 12 Chemistry 2021 Grade 12

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

Which of the following statements is true?

A
Melting point of Phosphorous is less than that of Nitrogen
B
N2 is highly reactive while P4 is inert
C
Nitrogen shows higher tendency of catenation than P
D
N-N is weaker than P-P

Which of the following is a non-stoichiometric defect?

A
Frenkel defect
B
Schottky defect
C
metal deficiency defect
D
interstitial defect

Identify the law which is stated as: 'For any solution, the partial vapour pressure of each volatile component in the solution is directly proportional to its mole fraction.'

A
Henry’s law
B
Raoult’s law
C
Dalton’s law
D
Gay-Lussac's Law

Pink colour of LiCl crystals is due to:

A
Schottky defect
B
Frenkel defect
C
Metal excess defect
D
Metal deficiency defect

Which of the following isomer has the highest melting point?

A
1,2-dichlorobenzene
B
1,3-dichlorobenzene
C
1,4-dichlorobenzene
D
All isomers have the same melting point

Which one of the following reactions is not explained by the open chain structure of glucose?

A
Formation of pentaacetate of glucose with acetic anhydride
B
Formation of addition product with 2,4 DNP reagent
C
Silver mirror formation with Tollen’s reagent
D
Existence of alpha and beta forms of glucose

Williamson’s synthesis of preparing dimethyl ether is an:

A
SN1 reaction
B
Elimination reaction
C
SN2 reaction
D
Nucleophilic addition reaction

Chlorine water loses its yellow colour on standing because:

A
HCl gas is produced, due to the action of sunlight
B
A mixture of HOCl and HCl is produced in the presence of light
C
HOCl and hydrogen gas is produced
D
A mixture of HCl and ClO3 is produced, due to the action of sunlight

During dehydration of alcohols to alkenes by heating with concentrated H2SO4, the initiation step is:

A
Protonation of alcohol molecule
B
Formation of carbocation
C
Elimination of water
D
Formation of an ester

Amorphous solids are:

A
Isotropic
B
Anisotropic
C
Isotopic
D
Isomeric

Which of the following reactions is used to prepare salicylaldehyde?

A
Kolbe’s reaction
B
Etard reaction
C
Reimer-Tiemann reaction
D
Stephen’s reduction

Which of the following is an example of a solid solution?

A
Sea water
B
Sugar solution
C
Smoke
D
22 carat gold

The boiling points of alcohols are higher than those of hydrocarbons of comparable masses due to:

A
Hydrogen bonding
B
Ion-dipole interaction
C
Dipole-dipole interaction
D
Van der Waals forces

Which of the following has the lowest boiling point?

A
H2O
B
H2S
C
H2Se
D
H2Te

Which of the following statement is correct?

A
Fibrous proteins are generally soluble in water
B
Albumin is an example of fibrous proteins
C
In fibrous proteins, the structure is stabilized by hydrogen bonds and disulphide bonds
D
pH does not affect the primary structure of protein

Major product obtained on reaction of 3-Phenyl propene with HBr in presence of organic peroxide:

A
3-Phenyl 1-bromopropane
B
1-Phenyl-3-bromopropane
C
1-Phenyl-2-bromopropane
D
3-Phenyl-2-bromopropane

Which of the following is a correct statement for C2H5Br?

A
It reacts with metallic Na to give ethane
B
It gives nitroethane on heating with aqueous solution of AgNO2
C
It gives C2H5OH on boiling with alcoholic potash
D
It forms diethylthioether on heating with alcoholic KSH

Covalency of nitrogen is restricted to:

A
2
B
3
C
4
D
5

Solubility of gases in liquids decreases with rise in temperature because dissolution is an:

A
Endothermic and reversible process
B
Exothermic and reversible process
C
Endothermic and irreversible process
D
Exothermic and irreversible process

All elements of Group 15 show allotropy except:

A
Nitrogen
B
Arsenic
C
Antimony
D
Bismuth

Which of the following is a polysaccharide?

A
Glucose
B
Maltose
C
Glycogen
D
Lactose

Substance having the lowest boiling point:

A
Hydrogen
B
Oxygen
C
Nitrogen
D
Helium

Lower molecular mass alcohols are:

A
Miscible in limited amount of water
B
Miscible in excess of water
C
Miscible in water in all proportions
D
Immiscible in water

Maximum oxidation state exhibited by Chlorine is:

A
+1
B
+3
C
+5
D
+7

In which of the following cases blood cells will shrink:

A
When placed in water containing more than 0.9% (mass/volume) NaCl solution
B
When placed in water containing less than 0.9% (mass/volume) NaCl solution
C
When placed in water containing 0.9% (mass/volume) NaCl solution
D
When placed in distilled water

How much ethyl alcohol must be added to 1 litre of water so that the solution will freeze at -14°C? (Kf for water = 1.86°C/mol)

A
7.5 mol
B
8.5 mol
C
9.5 mol
D
10.5 mol

Which reagents are required for one-step conversion of chlorobenzene to toluene?

A
CH3Cl / AlCl3
B
CH3Cl, Na, Dry ether
C
CH3Cl/Fe dark
D
NaNO2/ HCl / 0-5°C

On partial hydrolysis, XeF6 gives:

A
XeO3 + 4HF
B
XeO2F + HF
C
XeOF4 + H2
D
XeO2F2 + 4HF

Which one of the following statement is correct about sucrose:

A
It can reduce Tollen’s reagent, however cannot reduce Fehling’s reagent
B
It undergoes mutarotation like glucose and fructose
C
It undergoes inversion in the configuration on hydrolysis
D
It is laevorotatory in nature

Phenol does not undergo nucleophilic substitution reaction easily due to:

A
Acidic nature of phenol
B
Partial double bond character of C-OH bond
C
Partial double bond character of C-C bond
D
Instability of phenoxide ion